CL210 - Block-Migration Lab - CPU Unacceptable

Has anyone else run into CPU unacceptable errors when doing this migration? It was fine when I migrated it from compute1 to compute0 when but when I tried to get it to migrate back from compute0 to compute1 it failed with a CPU error.

Unacceptable CPU info: CPU doesn't have compatibility.

As far as I can tell with an lscpu the only minor difference is in the MHz speed on the two compute nodes. Some things I googled suggested going into /etc/nova/nova.conf and changing cpu_mode to none but it's already at that.

How are we supposed to fix this if it fails like this in the exam?